Conure
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Boiling and bumping, are these stones any good? (Video)
I want to try boiling dilute acids to concentrate them and I have red about the dangers of bumping. I tried putting some stones in a conical flask to
see if it makes things better.
Without stones I get some big bubbles and uneven boiling. With stones I get more uniform bubbles but lots noise as the stones vibrate against the
glass.
What do you think? Is this how it's supposed to be? Would it be safe to boil acids with stones like these?
https://youtu.be/Zl-gsq4B2ds?si=PVixj9oOpUCXsd7U
Also why doesn't bumping occur in metal kitchen wear?
[Edited on 21-11-2024 by Conure]
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Texium
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Thread Moved
21-11-2024 at 13:01 |
Texium
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Those boiling stones seem good. You probably don’t need to use so many. Small, rough stones like that are preferable to larger ones as they have a
high surface area and are unlikely to damage your flask from getting thrown around in it while boiling. So long as they are not reactive to acid, it
should be safe to use them.
Regardless, stirring is far better than boiling stones when available.
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fx-991ex
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Sometime i just have a stir bar in without stirring and it help.
Stones are hard on the glassware.
Like he said, you dont have to use that many stones.
[Edited on 21-11-2024 by fx-991ex]
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bnull
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The metal surface is not as smooth as glass. If you pay attention, you may be able to see the places where bubbles start forming.
You may use silica gel, especially the kind that comes in packets inside electronics boxes. Let them soaking for a while then turn on the heating. I
don't know exactly why but it seems to improve their anti-bump properties.
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BromicAcid
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As for the tinking on glass, we use PTFE boiling stones in my lab. Since it's a smooth surface it's more of an edge effect but there's no sound of
them beating against the flask. should be able to make them from any solid PTFE stopcock/stopper/etc you find so long as you have a knife and could
re-use them till the cows come home.
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Conure
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I tried silica gel and it works even better.
There is a bit of smell coming from it. Reminscent of new shoes and packaging in general.
Edit:
The silica gel only worked on the first test. After that the bumping got bad.
[Edited on 26-11-2024 by Conure]
[Edited on 26-11-2024 by Conure]
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Sir_Gawain
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Tempered glass shatters into cubes that make good boiling chips. A few years ago I accidentally broke the glass pane on a microwave door, and I’ve
been using the pieces to boil sulfuric acid ever since.
“Alchemy is trying to turn things yellow; chemistry is trying to avoid things turning yellow.” -Tom deP.
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